EvtukhovV. M. and BelozerovaM. A. (2008) “Asymptotic representations of the solutions of essentially nonlinear nonautonomous second-order differential equations”, Ukrains’kyi Matematychnyi Zhurnal, 60(3), pp. 310–331. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3158 (Accessed: 1September2024).